Question

An alloy of metal contains 45 percent nickel,25 percent copper and rest is zinc how much zinc is there in 3 kg alloys?

Answer 1

30 percent is zinc...so we can say one third is zinc
similarly in a 3kg alloy also one third is zinc
one third of 3 kgs is one kg

hence one kilogram of zinc is present

Answer 2

nickel=45%
copper=25%
zinc=100-(45+25)=30%of 3kg=900gm